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並前往https://www.quora.com/What-is-the-RJ45-pinout-for-ATV61-ATV71-drives

What is the RJ45 pinout for ATV61/ATV71 drives? - Quora

The RJ45 connector uses two wire RS-485 connection for Modbus communications. Pin 4 is the DB (+). Pin 5 is DA (-). These terminals are for communication.

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